Right now ClearRect on D2D 1.1 does not correctly support transforms or complex clips. This patch fixes that, notice the complex clip implementation is a not more elegant than it was for D2D 1.0, since we can use DESTINATION_OUT now.

Comment on attachment 8481968 [details] [diff] [review] Fix D2D 1.1 ClearRect to deal with transforms and complex clips Review of attachment 8481968 [details] [diff] [review]: ----------------------------------------------------------------- ::: gfx/2d/DrawTargetD2D1.cpp @@ +893,5 @@ > + if (!mPushedClips.size()) { > + return false; > + } > + > + std::vector<DrawTargetD2D1::PushedClip>::iterator iter = mPushedClips.begin(); auto iter @@ +898,5 @@ > + if (iter->mPath) { > + return false; > + } > + aClipRect = iter->mBounds; > + aIsPixelAligned = iter->mIsPixelAligned; You could fold this into into the loop below by initializing aClipRect to (0,0), mSize